Those temps are where you want to pull over, let everything cool down and put new fluid in. Before you go too far, check your connections really good and make sure the sensor is clean so it gets a good ground. After that, check that the cooler is actually getting hot. If it's cold, check that the bypass on the side of the trans is hot. If the cooler is cool and the bypass is hot, replace the bypass.

Slipping isn't always that noticeable, you would have to scan the truck and look at the input and output speed sensors. The factory gauge is basically a idiot light with just a few readings, it only moves when it's time for a new transmission. Your going to need to eliminate the gauge or the transmission as a issue.

So I made it home from Idaho. One of the guys on the trip was talking to me about what has been done to my truck. I have 4.33 gears from the stock 3.73 ratio. He said that the 4.33 gears were slowing down the rear pump in my auto trans, and the front pump was pushing more than it could handle causing the fluid to not circulate properly and heat up. Is there any truth to that?

At 70-75 I would hit 230-240 trans temps. slow down to 55-65 and it would drop to 210. Any help would be much appreciated.

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